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Ideas

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  • Active Digital Speaker:

    Digital value gets sent to the speaker.
    The position of the speaker diaphragm is read out to obtain a digital representation of the actual position.
    (this can be done using optics and hamming code, or some other means - e.g. interference patterns)
    The speaker compares the desired position with the actual position and moves the speaker cone/diaphragm till it reaches the desired position.

    Contrast with analog speakers - you send a voltage+current and the cone moves hopefully in the right wa

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